With the development of oil refining and chemical technology, pipeline leakage has become an important issue of concern to many chemical companies. The reason of pipeline leakage is largely due to the poor connection of pipeline flanges. Flange connection is one of the main ways of natural gas pipeline and equipment connection.
The key of the connection flange is the pre-tightening force generated by the connection bolt, and sufficient working sealing pressure can be achieved through the flange gasket to avoid gas leakage. Therefore, in order to make the flange connection dense and non-leakage, it is necessary to carefully select the flange gasket. So, do you know what gaskets can be used with flanges? How do we choose flange gaskets? Next, let the pipe fittings discuss the flange gasket with you.
How to choose flange gasket
The flat washer used in industry is generally composed of a sealing element and its internal and external reinforcing rings. The sealing element or washer body is the key part to avoid leakage.
Common materials include non-metallic materials, such as flexible graphite and polytetrafluoroethylene, fiber reinforced rubber based composite board; Of course, the sealing element material can also be rigid or flexible metal material.
Polytetrafluoroethylene coated shoe gasket is a kind of non-metal composite soft gasket, generally divided into two parts: shell and insert. The sleeve is corrosion resistant and is generally made of PTFE; Inserts are non-metallic materials with or without metallic reinforcement, generally made of asbestos rubber sheets.
Because the shell of the PTFE coated gasket is made of PTFE material, and PTFE material has good high and low temperature resistance, corrosion resistance, very low friction resistance, non-viscosity and other functional characteristics, these functional characteristics can also determine the performance characteristics and application field of PTFE coated gasket.
Polytetrafluoroethylene pad is suitable for corrosive media with nominal pressure PN of 0.6 ~ 5.0MPa and operating temperature of 0 ~ 150℃ or media with higher cleanliness requirements, it is used for full-plane and protrusive steel pipe flange connection.
When selecting flange gaskets, the choice should be made according to the working pressure, temperature and corrosion of the container. Generally used in low pressure, room temperature and non-corrosive media containers of rubber sheet
Medium and low pressure containers at moderate temperatures are usually made of asbestos rubber sheets or oil-resistant asbestos rubber sheets
Acid-resistant asbestos board often used for low-pressure vessels of general corrosive media; When the pressure is high, use polyethylene plate or teflon plate.
Well, the above is the “flange gasket suitable for use with flanges” type explanation, and its flange gasket selection basis, I hope our article will be hel
